EP1756888A2 - Procédé de fabrication d'un boîtier de batterie, boîtier de batterie et bande metallique pour ledit boîtier - Google Patents

Procédé de fabrication d'un boîtier de batterie, boîtier de batterie et bande metallique pour ledit boîtier

Info

Publication number
EP1756888A2
EP1756888A2 EP05750657A EP05750657A EP1756888A2 EP 1756888 A2 EP1756888 A2 EP 1756888A2 EP 05750657 A EP05750657 A EP 05750657A EP 05750657 A EP05750657 A EP 05750657A EP 1756888 A2 EP1756888 A2 EP 1756888A2
Authority
EP
European Patent Office
Prior art keywords
battery case
metal
strip
polymer layer
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05750657A
Other languages
German (de)
English (en)
Inventor
Arnoud Cornelis Adriaan De Vooys
Lene Hviid
Manja Boon
Catharina Hillegonda Maria De Moel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hille and Muller GmbH
Original Assignee
Hille and Muller GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hille and Muller GmbH filed Critical Hille and Muller GmbH
Priority to EP05750657A priority Critical patent/EP1756888A2/fr
Publication of EP1756888A2 publication Critical patent/EP1756888A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/1243—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the internal coating on the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H01M50/128—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to a method for producing a battery case.
  • the invention further relates to a battery case produced with said method and a battery produced with said battery case.
  • the invention further relates to a method for producing a strip.
  • batteries comprise a metal battery case, an electrolyte, a cathode and an anode.
  • Most battery cases have an electrically insulating layer on the outside to minimise the risk of shortcuts and associated catastrophic failures. In known batteries this electrically insulating layer is typically provided by means of a sleeve which is shrunk around the battery case, by means of a stick-on label or by means of a paint layer.
  • the electrically insulating layer is often also used as identification means to identify the producer or the brand of said batteries.
  • a commonly used method is imprinting the brand name or producer on the sleeve which is shrunk around the battery case, on the stick-on label or by painting it on the case.
  • the application of a shrink sleeve requires the application of the sleeve over the battery case or battery followed by a treatment to shrink the sleeve.
  • the shrink sleeves are quite expensive as well, adding to the cost of a commodity product. Since the external diameter is determined by the original equipment manufacturers and is fixed, this leaves less space for the electro-active materials and therefore results in a decrease of battery capacity.
  • a method for producing a battery case comprising the steps of providing a strip of a first metal having a first surface and a second surface; - providing said strip on the first surface with a layer of a second metal; - providing said strip on the second surface with an electrically insulating polymer layer; - forming a battery case from said strip in one or more forming steps wherein said battery case has an inner surface and an outer surface and wherein the first surface of the strip is turned to the inside of the battery case and the second surface of the strip is turned to the outside of the battery case.
  • a battery case or container having a layer of a second metal on at least the inside of the case, and a polymer layer on at least the outside of the case.
  • This layer of a second metal should be corrosion resistant to the contents of the battery when the battery case is used in a battery.
  • the forming steps may also comprise a blanking step in which a blank is formed from said strip of a first metal (hereinafter referred to in this description as metal strip or strip) and wherein the battery case is formed from said blank.
  • the polymer layer is electrically insulating and is applied on the metal strip before forming a battery case from said metal strip. Consequently, the insulating layer does not need to be applied to the individual batteries or battery cases one by one.
  • the thickness of the metal strip increases only with the thickness of the polymer layer.
  • the polymer layer may be provided to the metal strip by means of techniques such as roll-coating, laminating or co-extrusion. This ensures a consistent quality of the metal strip comprising the polymer layer and thereby a consistent quality of the battery case.
  • the second metal can be chosen independently of the first metal. In case the battery case consists essentially of a first metal, the corrosion resistant properties of the second metal can be chosen independently from the properties of the first metal, which may be optimised for its forming properties.
  • the battery case consists essentially of a formable metal (which may also be an alloy)
  • the forming properties and mechanical properties such as strength of the first metal are combined with the corrosion resistance of the layer of second metal which is present upon the first metal forming the battery case.
  • a draw-and-redraw (DRD) method for instance by a draw-and-redraw (DRD) method, a draw-and-iron (Dl) method or a draw-and-thin- redraw (DTR) forming method
  • said strip having a layer of a second metal on its second surface
  • lubrication during forming is required to facilitate the forming process and to reduce the wear of the forming tools.
  • an oil-emulsion is used for lubrication.
  • this emulsion has to be treated as chemical waste.
  • the oil needs to be removed from the battery case, which necessitates a cumbersome and expensive cleaning operation.
  • the presence of the polymer layer enables to use a small amount of wax as lubricant which does not have to be treated as chemical waste.
  • the wax can be removed during a simple heating operation, which could be included for other reasons as well. Cooling, if required, can be achieved by water, which is easily removed from the case and disposed of after use.
  • the battery case when used in a battery, is able to function at least as an electrical current collector, or otherwise enables transport of electrical current to one of the electrical contact positions of the battery such as the anode or the cathode.
  • the polymer layer is a thermoplastic polymer layer, preferably comprising PP and/or PET. If the polymer is also present on the inner surface of the battery case, it is preferable that the polymer is resistant to the electrolyte in the battery.
  • the polymer layer comprises a plurality of layers, for example an adhesion layer for adhesion to the battery case and a top layer.
  • the first metal is steel or a steel alloy suitable for forming operations, e.g. a low carbon steel, an extra-low carbon steel, an ultra-low carbon steel, an interstitial free steel, a microalloyed steel or a high strength steel.
  • suitable ranges for these steel alloys are given (all percentages in weight percent).
  • the layer of the second metal essentially consists of nickel.
  • Nickel has excellent corrosion resistance properties and is able to resist the contents of a battery when the battery case is used in a battery.
  • said layer of a second metal is applied to the strip of a first metal by means of a plating step, wherein preferably the second metal is chosen from the group of metals comprising one or more of nickel, cobalt, iron, tin, indium, palladium, bismuth and/or alloys thereof.
  • This metal layer may also comprise other metals such as Au, Ir, Rh, Zn, B, Fe, Si, Ge, Ln, Ti, P, Ga and their alloys and possibly combined with embedded electrically conducting substances such as graphite, soot, titaniumsulfide, titaniumnitride etc, or combinations thereof, as disclosed in EP1142041-B1.
  • the inner and the outer surface are provided with a layer of the second and a third metal respectively. These metal layers may protect the battery case against the electrolyte and/or it may serve as an adhesion layer to improve the adhesion between the metal of the battery case and the polymer layer.
  • the second metal and the third metal is the same metal.
  • the layer of the second and the third metal essentially consists of nickel because the inventors surprisingly found that a nickel-based coating provides excellent adhesion for the polymer layer. In this embodiment no additional process step of modification of the metal strip with for instance an electrolytic chromium coating is required, thus reducing costs.
  • the layer of a second metal on the first surface of the strip comprises a brittle metal layer, such as a bright nickel layer and a cobalt or cobalt alloy layer deposited thereupon as disclosed in German patent application 103 16 612.2, which is included herein by reference.
  • the advantage of having this brittle metal layer on the inner surface of the battery case is that the brittle metal layer gets cracked during the forming of the battery case resulting in an increased roughness and surface increase of the inner surface. This higher roughness decreases the contact resistance between the active cathode material and the inner side of the battery case, thereby improving the performance of the battery produced from said battery case.
  • additional layers may be provided on top of the layer of the second metal. These additional layers may be polymer layers such as a PET or PP, or metal layers chosen from the group as disclosed hereinabove.
  • said layer of a second metal is applied to the strip of a first metal by non-electrochemical methods, for instance by Physical Vapour Deposition (PVD), Chemical Vapour Deposition (CVD) or as disclosed in WO04/002634-A1.
  • PVD Physical Vapour Deposition
  • CVD Chemical Vapour Deposition
  • the battery case is heated at least once to heat-treat the polymer layer, optionally to above the melting temperature of the polymer layer, for instance between two forming steps and/or after the last forming step of the battery case.
  • This embodiment enables the polymer layer to recover from previous forming steps.
  • This heating of the battery case is preferably provided by induction heating, thereby indirectly heating the polymer layer.
  • the outer surface of the battery case is provided with an imprint.
  • This imprint may be provided with known printing methods.
  • the battery case thus produced does not need an additional shrink sleeve or label to identify the brand or producer and is therefore protected against counterfeiting or rebranding.
  • the polymer layer with the imprint is thinner than a shrink sleeve, the thickness of the battery case is reduced, thereby allowing a larger internal diameter of the battery produced from said battery case and thus potentially increasing the battery's capacity.
  • the imprint may be provided after forming of the battery case, but it may also be provided on the second surface of the strip prior to forming of the battery case.
  • the shape of the imprint has to be given such a shape so as to take the deformation during forming of the battery case into account so as to form the desired imprint of the proper final dimensions after forming of the battery case.
  • the imprint may also be provided to the second surface of the strip prior to the application of the polymer layer, whereby the imprint is covered by the polymer layer.
  • the imprint may have a decorative function, but it may also have an identification function. Identification marks such as a bar code could be imprinted on the batter case for example for identifying the batch or producer of the battery.
  • the electrically conducting contact at the location of the electrical contact positions when using the battery case in a battery may be provided by locally removing the polymer layer of the outer surface of the battery case or battery.
  • This removal of the polymer layer may be done by known methods such as mechanical grinding or chemical dissolving.
  • a method for producing a battery case comprising at least one electrical contact position and wherein the polymer layer is removed at the location of the contact position by using a laser for enabling electrical contact.
  • the inventors found that it is beneficial to use a laser to locally remove the polymer layer of the outer surface of the battery case or battery. No solid or liquid wastes are produced, which has environmental and economical advantages.
  • the surface of the battery case is not oxidised, as the removal takes place in an effective reducing atmosphere, leading to a lower contact resistance and better battery performance.
  • an advantage is that the removal of the polymer layer creates a carbon rich environment, which allows the formation of surface carbides on the electrical contact positions, which in turn are electrically conductive, less prone to oxidation and relatively brittle so a good contact is more easily made. Also, since the metal strip has a high heat capacity, a high heat conductivity and a high reflectivity, the effect of the laser on the surface of the metal strip is minimal and the process is more stable, which is also beneficial for geometrical accuracy.
  • a battery case produced as described hereinabove, having an inner surface and an outer surface, wherein at least the inner surface of the case is provided with the layer of the second metal and wherein at least the outer surface is provided with the polymer layer which is electrically insulating.
  • the polymer layer could form the outermost surface of the battery case, or could be coated.
  • This additional coating or coatings can be applied by any known method, such as varnishing, lacquering, printing or a combination thereof, and said additional coating or coatings could cover the entire outer surface of the battery case or part of the outer surface of the battery.
  • the inner and the outer surface are provided with a metal plating layer.
  • This metal layer may protect the metal of the battery case against the electrolyte and/or it may serve as an adhesion layer to improve the adhesion between the metal of the battery case and the polymer layer.
  • the metal in the metal plating layer on the inner and the outer surface is the same metal.
  • the layer of a second metal essentially consists of nickel because the inventors surprisingly found that a nickel-based coating provides excellent adhesion for the polymer layer.
  • the polymer layer on the battery case comprises PET and/or PP.
  • the layer of a second metal essentially consists of nickel and/or the polymer layer comprises PET and/or PP.
  • At least the polymer layer on the outer surface of the battery case is provided with an imprint.
  • This imprint may be provided with known methods.
  • the battery case thus produced does not need an additional shrink sleeve to identify the brand or producer and is therefore protected against counterfeiting or rebranding.
  • the polymer layer with the imprint is thinner than a shrink sleeve, the thickness of the battery is reduced.
  • the imprint may be provided after forming of the battery case, but it may also be provided on the second surface of the strip prior to forming of the battery case.
  • the imprint may have a decorative function, but it may also have an identification function. Identification marks such as a bar code could be imprinted on the battery case for example for identifying the batch or producer of the battery.
  • the electrically contact position or positions of the battery may be provided by removing the polymer layer of the outer surface of the battery case at the location of the contact position or positions for enabling electrical contact.
  • the metal of the metal strip is steel or a steel alloy suitable for forming operations, e.g. a low carbon steel, an extra-low carbon steel, an ultra-low carbon steel, an interstitial free steel, a microalloyed steel or a high strength steel (see table 1 for typical ranges).
  • the battery case as described hereinabove is particularly suitable for batteries of the alkaline type or of the rechargeable type such as the Ni-Cd or metal-hydride type.
  • the first metal and the second metal are the same metals, namely zinc.
  • the outer surface of the Zn-battery case may then be provided with the electrically insulating polymer coating.
  • the Zn-battery case may be enveloped by a thin sleeve of tinplate to protect the Zn-battery case against denting.
  • a battery produced using a battery case as described hereinabove comprising at least one electrical contact position such as an anode or a cathode, wherein the polymer layer has been removed at the location of the contact position for enabling electrical contact.
  • a method for producing a strip comprising the steps of - producing a strip of a first metal, said strip having a first surface and a second surface; providing said strip with a layer of a second metal on the first surface, preferably wherein the second metal essentially consists of nickel; performing recrystallisation annealing of said strip; - coating said strip on the second surface with an electrically insulating polymer layer, preferably comprising PET and/or PP, preferably by co-extrusion or laminating rolling; so as be able to produce battery cases as described hereinabove.
  • the strip is provided with a layer of the second metal on the first surface wherein the layer preferably essentially consists of nickel.
  • the strip may also be provided with a layer of a third metal on the outer surface of the battery case, which is subsequently coated with the polymer layer.
  • the third metal and the second metal are the same, effectively coating the inner and the outer surface of the battery case with the same metal, preferably a nickel-based coating essentially consisting of nickel.
  • the polymer layer is resistant against the electrolyte in when the battery case produced is used in a battery.
  • the first metal is a steel or a steel alloy suitable for forming operations, e.g. a steel selected from the steel types as described hereinabove.
  • the strip of a first metal may be produced according to known methods, such as steel- making followed by hot-rolling.
  • the hot-rolled strip is then cold-rolled to a final cold- rolling thickness.
  • the layer of a second metal on the first metal is provided by means of a plating step.
  • a very thin and homogeneous layer of a second metal may be applied to the first metal.
  • the recrystallisation annealing step takes place after the provision of the layer of a second metal on the first metal and prior to coating said strip on the second surface with a polymer layer.
  • a diffusion layer builds up in the nickel layer providing excellent adhesion to the first metal.
  • the substrate was coated with PP or PET by either laminar rolling or co-extrusion.
  • AA-size cases were made from this material by deep drawing in one cupping step and 5 redraw steps. Prior to the drawing operations both surfaces were coated with an appropriate wax for lubrication.
  • the cases were heat treated to above the melting point of the polymer, and quenched in water. After deformation, the outer surface of the cases were imprinted with ink and cured in either an UV-curing step or a temperature curing step and proper adhesion of both the polymer and the print was confirmed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

La présente invention concerne procédé de production de boîtier d'accumulateur qui consiste à prendre une bande de d'un premier métal possédant une première surface une seconde surface, à revêtir cette bande sur la première surface d'une couche du second métal, à revêtir cette bande sur la seconde surface d'une couche de polymères électriquement isolante, à former un boîtier d'accumulateur à partir de cette bande en une ou plusieurs étapes de formage, ce boîtier d'accumulateur possédant une surface intérieure et une surface extérieure et, la première surface de la bande est tournée vers l'intérieur du boîtier d'accumulateur et la seconde surface de cette bande est tournée vers l'extérieur du boîtier d'accumulateur. Cette invention concerne aussi un boîtier d'accumulateur produit par ce procédé et un accumulateur produit avec ce boîtier d'accumulateur. Cette invention concerne enfin un procédé de production de bande.
EP05750657A 2004-06-04 2005-06-03 Procédé de fabrication d'un boîtier de batterie, boîtier de batterie et bande metallique pour ledit boîtier Withdrawn EP1756888A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05750657A EP1756888A2 (fr) 2004-06-04 2005-06-03 Procédé de fabrication d'un boîtier de batterie, boîtier de batterie et bande metallique pour ledit boîtier

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP04076638 2004-06-04
EP04076996 2004-07-09
PCT/EP2005/006073 WO2005119814A2 (fr) 2004-06-04 2005-06-03 Procede de production de boitier d'accumulateur, boitier d'accumulateur et bande metallique permettant de produire ce boitier d'accumulateur
EP05750657A EP1756888A2 (fr) 2004-06-04 2005-06-03 Procédé de fabrication d'un boîtier de batterie, boîtier de batterie et bande metallique pour ledit boîtier

Publications (1)

Publication Number Publication Date
EP1756888A2 true EP1756888A2 (fr) 2007-02-28

Family

ID=35276542

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05750657A Withdrawn EP1756888A2 (fr) 2004-06-04 2005-06-03 Procédé de fabrication d'un boîtier de batterie, boîtier de batterie et bande metallique pour ledit boîtier

Country Status (2)

Country Link
EP (1) EP1756888A2 (fr)
WO (1) WO2005119814A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009049890A1 (de) * 2009-10-20 2011-04-21 H & T Marsberg Gmbh & Co. Kg Galvanisches Element als Gerätebatterie
DE102011088739A1 (de) * 2011-12-15 2013-06-20 Robert Bosch Gmbh Gehäuse für eine Batteriezelle mit einer Lackbeschichtung zur elektrischen Isolation, Batteriezelle, Batterie sowie Kraftfahrzeug
DE102012213868A1 (de) * 2012-08-06 2014-02-06 Robert Bosch Gmbh Batterie mit einem metallischen Gehäuse, Verfahren zur Herstellung einer Beschichtung von metallischen Batteriegehäusen und Kraftfahrzeug
EP3246767B1 (fr) * 2016-05-19 2019-01-09 The Swatch Group Research and Development Ltd. Procédé de fabrication d'une piece d'horlogerie dotée d'un élément d'habillage creux ou en relief
CN115295934B (zh) * 2022-08-08 2024-04-26 常州长盈精密技术有限公司 圆柱电池壳、圆柱电池及其制造工艺

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Publication number Priority date Publication date Assignee Title
US4647714A (en) * 1984-12-28 1987-03-03 Sohwa Laminate Printing Co., Ltd. Composite sheet material for magnetic and electronic shielding and product obtained therefrom
US5057385A (en) * 1990-12-14 1991-10-15 Hope Henry F Battery packaging construction
JPH08287885A (ja) * 1995-04-12 1996-11-01 Nisshin Steel Co Ltd アルカリ乾電池正極缶用塗装金属板
CA2323898A1 (fr) * 1998-03-18 1999-09-23 Ntk Powerdex, Inc. Materiau pour enveloppes de batteries hermetiques
US6503658B1 (en) * 2001-07-11 2003-01-07 Electro Energy, Inc. Bipolar electrochemical battery of stacked wafer cells

Non-Patent Citations (1)

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Title
See references of WO2005119814A2 *

Also Published As

Publication number Publication date
WO2005119814A2 (fr) 2005-12-15
WO2005119814A3 (fr) 2006-08-24

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